package chap5.trade;

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

/**
 * @author lixiangke
 * @date 2018/8/27
 */
public class Main {
    public static void main(String[] args) {
        Trader raoul = new Trader("Raoul", "Cambridge");
        Trader mario = new Trader("Mario","Milan");
        Trader alan = new Trader("Alan","Cambridge");
        Trader brian = new Trader("Brian","Cambridge");

        List<Transaction> transactions = Arrays.asList(
                new Transaction(brian, 2011, 300),
                new Transaction(raoul, 2012, 1000),
                new Transaction(raoul, 2011, 400),
                new Transaction(mario, 2012, 710),
                new Transaction(mario, 2012, 700),
                new Transaction(alan, 2012, 950)
        );

        // 找出2011年发生的所有交易，并按交易额排序（从低到高）
        List<Transaction> t2011 = transactions.stream()
                .filter(transaction -> transaction.getYear() == 2011)
                .sorted(Comparator.comparing(Transaction::getValue))
                .collect(Collectors.toList());
        System.out.println(t2011);

        // 交易员都在哪些不同的城市工作过？
        List<String> cities = transactions.stream()
                .map(transaction -> transaction.getTrader().getCity())
                .distinct()
                .collect(Collectors.toList());
        System.out.println(cities);

        // 查找所有来自于剑桥的交易员，并按姓名排序。
        List<Trader> traders = transactions.stream()
                .map(Transaction::getTrader)
                .filter(trader -> trader.getCity().equals("Cambridge"))
                .distinct()
                .sorted(Comparator.comparing(Trader::getName))
                .collect(Collectors.toList());
        System.out.println(traders);

        // 返回所有交易员的姓名字符串，按字母顺序排序
        String traderNames = transactions.stream()
                .map(transaction -> transaction.getTrader().getName())
                .distinct()
                .sorted()
                .reduce("", (s, s2) -> s + s2); // .collect(joining());
        System.out.println(traderNames);

        // 有没有交易员是在米兰工作的？
        boolean milanBased = transactions.stream()
                .anyMatch(transaction -> transaction.getTrader().getCity().equals("Milan"));
        System.out.println(milanBased);

        // 打印生活在剑桥的交易员的所有交易额。
        int v = transactions.stream()
                .filter(transaction -> transaction.getTrader().getCity().equals("Cambridge"))
                .map(Transaction::getValue)
                .reduce(0, (a, b) -> a + b);
        System.out.println(v);

        // 打印生活在剑桥的交易员的所有交易额。
        transactions.stream()
                .filter(transaction -> transaction.getTrader().getCity().equals("Cambridge"))
                .map(Transaction::getValue)
                .forEach(System.out::println);

        // 所有交易中，最高的交易额是多少？
        Optional<Integer> max = transactions.stream()
                .map(Transaction::getValue)
                .reduce((a, b) -> a > b ? a : b); // .reduce(Integer::max);
        System.out.println(max.get());

        // 找到交易额最小的交易。
        Optional<Integer> min = transactions.stream()
                .map(Transaction::getValue)
                .reduce((a, b) -> a > b ? b : a); // .reduce(Integer::max);
        System.out.println(min.get());

        // 找到交易额最小的交易。// 更好的方法
        Optional<Transaction> min2 = transactions.stream()
                .min(Comparator.comparing(Transaction::getValue));
        System.out.println(min2.get().getValue());
    }
}

//(8)